GB1525818A - Alarm generating apparatus - Google Patents

Alarm generating apparatus

Info

Publication number
GB1525818A
GB1525818A GB38891/76A GB3889176A GB1525818A GB 1525818 A GB1525818 A GB 1525818A GB 38891/76 A GB38891/76 A GB 38891/76A GB 3889176 A GB3889176 A GB 3889176A GB 1525818 A GB1525818 A GB 1525818A
Authority
GB
United Kingdom
Prior art keywords
transducer
frequency
time
generating apparatus
alarm generating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB38891/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Publication of GB1525818A publication Critical patent/GB1525818A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/02—Constructional details
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated

Abstract

1525818 Alarm generating apparatus DAINI SEIKOSHA KK 20 Sept 1976 [22 Sept 1975] 38891/76 Heading G5J Alarm generating apparatus comprises an electro-acoustic transducer having a resonant frequency in the audible range, and driving circuitry, including time-setting means, producing a driving signal for the transducer during a predetermined time-period whose frequency varies unidirectionally within a range including the resonant frequency so that, in operation, the frequency and the volume of the audible sound produced by the transducer change with time. The frequency of the driving signal may vary continuously and linearly or stepwise. The apparatus may be incorporated into a watch or a selective calling system. The time-setting means may be a one-shot multivibrator, and reset means may be provided for terminating the audible sound produced by the transducer.
GB38891/76A 1975-09-22 1976-09-20 Alarm generating apparatus Expired GB1525818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50114543A JPS5238259A (en) 1975-09-22 1975-09-22 Alarm sound producing device

Publications (1)

Publication Number Publication Date
GB1525818A true GB1525818A (en) 1978-09-20

Family

ID=14640393

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38891/76A Expired GB1525818A (en) 1975-09-22 1976-09-20 Alarm generating apparatus

Country Status (4)

Country Link
JP (1) JPS5238259A (en)
CH (1) CH617818GA3 (en)
DE (1) DE2641149A1 (en)
GB (1) GB1525818A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54670A (en) * 1977-05-26 1979-01-06 Seiko Instr & Electronics Ltd Alarm wrista watch
JPH01148991A (en) * 1987-12-07 1989-06-12 Matsushita Electric Ind Co Ltd Alarm sound generator
JP6017499B2 (en) * 2014-06-26 2016-11-02 京セラドキュメントソリューションズ株式会社 Electronic device and notification sound output program
EP3591475B1 (en) * 2018-07-02 2021-02-24 The Swatch Group Research and Development Ltd Thermoelectric watch suitable for being tested in production or after-sales service

Also Published As

Publication number Publication date
CH617818B (en)
CH617818GA3 (en) 1980-06-30
DE2641149A1 (en) 1977-03-31
JPS5238259A (en) 1977-03-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920920